Kerf-boring machine for mining coal and like minerals,申请号US19480055202-传众专利搜索

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发明名称	Kerf-boring machine for mining coal and like minerals
摘要
申请公布号	US2637542(A)	申请公布日期	1953.05.05
申请号	US19480055202	申请日期	1948.10.18
申请人	JULIUS YARMAK	发明人	YARMAK JULIUS
分类号	E21C27/22	主分类号	E21C27/22
代理机构		代理人
主权项
地址

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